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On five of the major social media networks -- Twitter, Facebook, Linked In, Instagram and Pinterest -- user interaction peaks at certain times. (all times Eastern) is an ideal time to send out a tweet, while Thursday at 8 p.m.

provides the greatest chance of a customer clicking, liking, sharing or commenting on a Facebook post.

Weingarten described the story as the most difficult he'd ever reported and written.

It touched off waves of support and abuse for the parents who came forward to share their stories.

On Monday, Weingarten won the 2010 Pulitzer Prize for feature writing for his story.